Detection device and method

Abstract

The invention relates to the technical field of structural component testing, and particularly provides a detection device and method. The detection device is used for detecting the assembly condition of the sealing element in the cylinder body. The device comprises a detection table used for fixing the cylinder body, a piston simulation rod capable of extending into the cylinder body and an inflation unit. Wherein the piston simulation rod extending into the cylinder body can be in sealing fit with a sealing element located on the inner wall of the cylinder body, so that a closed inflation chamber is formed on one side of the sealing element; the inflation unit is used for inflating gas with set pressure into the inflation cavity, and a pressure detection part used for detecting the air pressure value in the inflation cavity is arranged in the inflation unit. According to the detection device, the piston simulation rod is adopted to replace a piston matched with the cylinder body, the situation that the sealing element in the cylinder body is not assembled in place can be detected in advance, and therefore the technical scheme suitable for detecting the assembling situation of the sealing element in the cylinder body in advance is provided.

Description

Technical Field

[0001] The present invention relates to the technical field of structural component testing, and particularly to a detection device for detecting the assembly condition of a seal in a cylinder body. In addition, the present invention also relates to a detection method for detecting the assembly condition of a seal in a cylinder body. Background Art

[0002] In a braking system, a hydraulic cylinder (pressure - building cylinder) for providing brake oil pressure is configured. Grooves are provided on the inner wall of the cylinder body, and seals are installed in the grooves to play a sealing role between the piston and the inner wall of the cylinder body.

[0003] Regarding the assembly conditions of the above - mentioned pressure - building cylinder and other similar seals in the cylinder body, in order to ensure the assembly effect and sealing performance of the cup seals in the cylinder body, it is necessary to detect, identify, and judge the performance of the cup seals assembled in the cylinder body. Currently, the judgment of the assembly effect of the cup seals is divided into in - station detection and subsequent - station performance testing. The means of in - station detection usually can only take pictures to identify the presence or absence of the cup seals, and cannot judge situations such as breakage and leakage of the cup seals. The subsequent - station performance testing needs to be carried out after the assembly of the piston, and test the pressure - building ability of the hydraulic cylinder product during the actual hydraulic pressure establishment process; once it is found that the pressure - building performance of the product is insufficient, it is also necessary to replace the corresponding cup seals, and the ability to detect cup seal assembly problems in advance is too poor. Summary of the Invention

[0004] In view of this, the present invention aims to propose a detection device to provide a technical solution suitable for pre - detecting the assembly condition of the seal in the cylinder body.

[0005] To achieve the above - mentioned purpose, the technical solution of the present invention is realized as follows:

[0006] A detection device for detecting the assembly condition of a seal in a cylinder body, including a detection table for fixing the cylinder body, a piston simulation rod that can extend into the cylinder body, and an inflation unit; the piston simulation rod extending into the cylinder body can be in sealing cooperation with the seal located on the inner wall of the cylinder body to form a sealed inflation chamber on one side of the seal; the inflation unit is used to fill the inflation chamber with gas at a set pressure, and a pressure detection component for detecting the air pressure value in the inflation chamber is provided in the inflation unit.

[0007] Furthermore, a driving mechanism is also provided on the detection table, and the piston simulation rod is arranged on the driving mechanism; the driving mechanism can move the piston simulation rod to the entrance of the seal and can drive the piston simulation rod to extend to a set position in the cylinder body.

[0008] Further, a piston section for sealingly mating with the seal is provided on the rod body of the piston simulation rod, and a connection part is provided at the end of the piston simulation rod; the piston simulation rod is connected to the drive mechanism through the connection part, and the diameter of the piston section is smaller than the diameter of the piston it simulates.

[0009] Further, the piston section includes a front piston section and a rear piston section arranged at intervals, and the part of the rod body of the piston simulation rod between the front piston section and the rear piston section is set as a reduced-diameter section; the front piston section and the rear piston section can respectively seal and cooperate with two groups of seals arranged at intervals on the inner wall of the cylinder body, and an inflation chamber is formed between the reduced-diameter section and the inner wall of the cylinder body.

[0010] Further, the cylinders fixed on the test bench are arranged vertically, and the inlet of the cylinder is located at the top; a floating sleeve is provided on the drive mechanism, and the connection part is connected to the floating sleeve; after the drive mechanism drives the floating sleeve to align with the inlet of the cylinder, the piston simulation rod can float on the floating sleeve within the alignment deviation range of the floating sleeve to smoothly extend into the cylinder.

[0011] Further, the inflation unit includes an air supply pipeline communicating between the compressed air source and the inflation chamber, and a control valve provided on the air supply pipeline; the pressure detection component includes a pressure sensor provided on the air supply pipeline between the control valve and the inflation chamber.

[0012] Further, an exhaust pipeline with controllable on-off is communicated with the air supply pipeline between the control valve and the inflation chamber, and / or a pressure regulating valve is provided on the air supply pipeline upstream of the control valve.

[0013] Further, the inflation unit further includes a switching pipeline with controllable on-off; the switching pipeline is connected to the cylinder body and communicates with the chamber between two adjacent seals on the inner wall of the cylinder body. By changing the on-off state of the switching pipeline, one of the two seals can be selectively detected.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] (1) The detection device of the present invention can fix the cylinder block of the hydraulic cylinder to be detected on the detection table by setting up the detection table; by configuring the piston simulation rod and the inflation unit, the piston simulation rod extending into the cylinder is used to simulate the piston, and is hermetically fitted with seals such as cup leather on the inner wall of the cylinder to form an inflation chamber to be detected for inflation. The inflation unit is used to fill the inflation chamber with gas at a set pressure. By detecting and observing the air pressure value measured by the pressure detection component, it can be known whether the inflation chamber can be inflated to reach the required target air pressure value, and thus it can be accurately and effectively known whether the assembly of the seal is in place, so as to achieve the purpose of pre-detecting the assembly situation of the seal, thereby providing a technical solution suitable for pre-detecting the assembly situation of the seal in the cylinder.

[0016] (2) By configuring a driving mechanism on the detection table, the driving mechanism can carry the piston simulation rod to move to successfully and accurately complete the alignment with the inlet of the hydraulic cylinder and the action of inserting into the cylinder.

[0017] (3) A piston section for sealing fit and a connecting part for connection and installation are provided on the piston simulation rod, which can respectively realize the sealing with the seal and the installation connection with the driving mechanism. Making the diameter of the piston section smaller than the diameter of the piston it is to simulate can achieve the fully expanded state of the seal, so as to test the sealing performance of the seal under extreme sealing conditions.

[0018] (4) Two piston sections are provided, and a reduced-diameter section is machined between the two piston sections. Obviously, the diameter of the reduced-diameter section should be much smaller than the diameter of the piston section, so that there are gaps between the reduced-diameter section and the inner wall of the cylinder and between the reduced-diameter section and the inner wall of the seal, ensuring that the seal is avoided from the reduced-diameter section, and realizing the idle stroke interval of the piston simulation rod; inflating the inflation chamber formed between the reduced-diameter section and the inner wall of the cylinder can detect the sealing situation of the seals hermetically fitted with the front piston section and the rear piston section on the cylinder respectively.

[0019] (5) A floating sleeve is provided on the driving mechanism, which can well overcome the alignment deviation problem between the floating sleeve and the inlet of the hydraulic cylinder. When the driving mechanism carries the floating sleeve to move directly above the hydraulic cylinder, the alignment action between the floating sleeve and the inlet of the hydraulic cylinder is completed, so that the piston simulation rod is aligned with the inlet of the hydraulic cylinder; since the connecting part is arranged in the floating sleeve, the piston simulation rod can be allowed to move within the horizontal range of the alignment deviation, so that the rod body of the piston simulation rod can smoothly move down and extend into the cylinder during the downward movement driven by the driving mechanism, avoiding interference, collision and strong friction between the rod body of the piston simulation rod and the inner wall of the cylinder.

[0020] (6) By setting a control valve on the air supply pipeline, the on-off state of the air supply pipeline can be flexibly controlled to timely fill the inflation chamber with compressed gas. A pressure sensor is set on the air supply pipeline downstream of the control valve. Through the detection of the pressure sensor, the air pressure in the inflation chamber can be understood in real time, that is, the air pressure value in the inflation chamber required for seal detection can be obtained.

[0021] (7) An exhaust pipeline is connected and set on the air supply pipeline downstream of the control valve. During the inflation detection stage, the exhaust pipeline can be disconnected; after the detection is completed, the exhaust pipeline can be conducted to discharge the gas in the inflation chamber. The on-off control of the exhaust pipeline can adopt the method of adding an electromagnetic valve. A pressure regulating valve is set on the air supply pipeline upstream of the control valve, and the air supply pressure value of the air supply pipeline can be adjusted to provide compressed gas with a suitable pressure according to the detection requirements of the seal.

[0022] (8) Adding a switching pipeline can meet the situation where multiple seals are arranged adjacent to each other in the cylinder body, and realize flexible and efficient detection of multiple seals in the cylinder body.

[0023] Another object of the present invention is to propose a detection method for detecting the assembly situation of seals in a cylinder body. The method includes:

[0024] Insert a piston simulation rod into the cylinder body so that the piston simulation rod is in sealing fit with the seal located on the inner wall of the cylinder body to form a sealed inflation chamber on one side of the seal;

[0025] Fill the inflation chamber with gas at a set pressure and obtain the change of the air pressure value in the inflation chamber in real time;

[0026] Compare the air pressure value with a preset target air pressure value. When the air pressure value reaches the set target air pressure value, it is determined that the seal is assembled in place.

[0027] Further, in the case of determining that the seal is assembled in place, the detection method further includes a sealing and pressure-holding performance test of the seal; the sealing and pressure-holding performance test includes:

[0028] Obtain the air pressure attenuation amount of the inflation chamber within a set time;

[0029] Compare the air pressure attenuation amount with a preset air pressure attenuation threshold. When the air pressure attenuation amount is below the air pressure attenuation threshold, it is determined that the sealing and pressure-holding performance of the seal is qualified.

[0030] Compared with the prior art, the detection method of the present invention has the following advantages:

[0031] The detection method of the present invention uses a piston simulation rod to replace the piston adapted to the cylinder body of the hydraulic cylinder, and pre-detects the assembly condition of the seal in the cylinder body, so as to eliminate the situation where the seal is not assembled in place; by using the sealing fit between the piston simulation rod and the seal, a sealed inflation chamber will be formed in the cylinder body on one side of the seal. By inflating the inflation chamber and checking whether the inflation can reach the set target air pressure value, it can be accurately and effectively known whether the seal is assembled in place, so as to achieve the purpose of pre-detecting the assembly condition of the seal, thereby providing a technical solution suitable for pre-detecting the assembly condition of the seal in the cylinder body.

[0032] In addition, in the case of proper assembly, a sealing and pressure-holding performance test is carried out on the inflation chamber formed by the seal. By checking and comparing whether the air pressure attenuation amount in the inflation chamber exceeds the preset air pressure attenuation threshold, it can be accurately judged whether there are situations such as damage and micro-leakage of the seal, and further judge whether the sealing and pressure-holding performance of the seal is qualified, making the detection method of the present invention have more complete seal detection performance and effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention. The front, back, up, down and other orientation words involved herein are only used to represent relative positional relationships and do not constitute improper limitations on the present invention. In the drawings:

[0034] Figure 1 is a three-dimensional structural schematic diagram of the detection device according to the embodiment of the present invention;

[0035] Figure 2 is a partial structural schematic diagram of the detection device according to the embodiment of the present invention;

[0036] Figure 3 is a three-dimensional structural schematic diagram of the piston simulation rod according to the embodiment of the present invention;

[0037] Figure 4 is a front view of the piston simulation rod according to the embodiment of the present invention;

[0038] Figure 5 is Figure 7 a sectional structural schematic diagram of the part shown by A-A in

[0039] Figure 6 is an inflation principle schematic diagram of the detection device according to the embodiment of the present invention when the piston simulation rod is in the first detection position;

[0040] Figure 7 is an inflation principle schematic diagram of the detection device according to the embodiment of the present invention when the piston simulation rod is in the second detection position;

[0041] Figure 8 This is a schematic cross-sectional structure diagram of the shaft section of the hydraulic cylinder in the state where the piston simulation rod and the leather cup of the present invention are in sealing fit.

[0042] Figure 9 It is Figure 8 A partial enlarged view of the part shown as B in

[0043] Figure 10 This is a schematic system flow diagram of the detection method according to the embodiment of the present invention.

[0044] Explanation of reference numerals:

[0045] 1. Detection table; 2. Piston simulation rod; 20. Reduced diameter section; 21. Front piston section; 22. Rear piston section; 23. Connecting part; 230. Connecting hole; 231. Positioning hole;

[0046] 3. Inflation unit; 301. First control valve; 302. Second control valve; 303. Third control valve; 304. Fourth control valve; 305. Fifth control valve; 306. Sixth control valve;

[0047] 31. Air supply pipeline; 311. First branch; 312. Second branch; 313. First exhaust pipeline; 314. Second exhaust pipeline; 315. First switching pipeline; 316. Second switching pipeline;

[0048] 321. First pressure sensor; 322. Second pressure sensor;

[0049] 330. Compressed air source; 331. Pressure regulating valve;

[0050] 341. First muffler; 342. Second muffler;

[0051] 4. Driving mechanism; 40. Floating sleeve;

[0052] 5. Hydraulic cylinder; 50. Cylinder block; 51. First inflation chamber; 52. Second inflation chamber;

[0053] 61. First leather cup; 62. Second leather cup; 63. Third leather cup; 64. Fourth leather cup; 600. Inner wall; 601. Outer wall. Detailed implementation manners

[0054] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0055] In the description of the present invention, it should be stated that if terms indicating orientation or positional relationship such as "upper, lower, left, right, front, rear, inner, outer" appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed or operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0056] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connected to", and "connecting member" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific situations. The limiting terms such as "first, second, A, B, C, D" that appear in the description of the present invention are only used to distinguish similar features in different positions, ownerships, or uses, etc., for the purpose of avoiding ambiguity and confusion in the description, and should not be understood as indicating or implying relative importance.

[0057] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0058] Embodiment 1

[0059] This embodiment relates to a detection device for detecting the assembly condition of a seal in a cylinder block 50, and provides a technical solution and related detection device suitable for pre-detecting the assembly condition of the seal in the cylinder block 50; an exemplary structure thereof is as Figure 1 , Figure 2 and Figure 3 shown.

[0060] Overall, the detection device of this embodiment includes a detection table 1 for fixing the cylinder block 50, a piston simulation rod 2 that can extend into the cylinder block 50, and an inflation unit 3. Among them, the piston simulation rod 2 extending into the cylinder block 50 can be in sealing cooperation with the seal located on the inner wall of the cylinder block 50 to form a sealed inflation chamber on one side of the seal; the inflation unit 3 is used to fill the inflation chamber with gas at a set pressure, and a pressure detection component for detecting the air pressure value in the inflation chamber is provided in the inflation unit 3.

[0061] It should be noted that based on the above overall design concept, the technical solution of the present invention can adopt various different specific implementation forms or configuration sequences. For example, the above inflation unit 3 can adopt an air pump with a set pressure output, or a compressed air source with a set pressure in cooperation with a control valve to control the inflation situation; the acquisition of the air pressure value in the inflation chamber can be monitored by a pressure detection component provided in the cylinder block 50 or on the air supply pipeline 31. For the parts required for the implementation of the overall solution but not involved in the above overall settings, reasonable and flexible designs can be made with reference to the mature setting means in the art, the actual situation during implementation, etc. The following specific implementation solutions in this embodiment are only one of the relatively superior ones among the many solutions that can be formed by the above various combinations and their variations. In actual implementation, those skilled in the art can make flexible adjustments and improvements in combination with the actual situation. Obviously, the many solutions that can be formed by the above various specific form combinations and their variations, as well as the specific implementation solutions in this embodiment, are all within the protection scope of the present invention.

[0062] In addition, the above cylinder block 50 can be the cylinder block 50 of the hydraulic cylinder 5 that provides the brake oil pressure configured in the braking system, or the cylinder block of a hydraulic cylinder in other hydraulic application scenarios; similarly, the above sealing member can be an O-ring, a gasket, etc., or a leather cup in the cylinder block 50 of the hydraulic cylinder 5 dedicated to the braking system. For the convenience of description and understanding, this embodiment takes the cylinder block 50 of the hydraulic cylinder 5 in the braking system and the leather cup assembled thereon as examples for illustration. When the leather cup is used as the detection object, due to the cross-sectional shape characteristics of the leather cup, the above inflation chamber will be formed on the side where the mouth of the leather cup faces.

[0063] Specifically, as Figure 2 shown, the device further includes a driving mechanism 4 provided on the detection table 1, and the piston simulation rod 2 is arranged on the driving mechanism 4; the driving mechanism 4 can move the piston simulation rod 2 to the entrance of the hydraulic cylinder 5 and can drive the piston simulation rod 2 to extend into a set position in the cylinder block 50. By configuring the driving mechanism 4 on the detection table 1, using the driving mechanism 4 to carry the piston simulation rod 2 to move can smoothly and accurately complete the alignment with the entrance of the hydraulic cylinder 5 and the action of inserting into the interior of the cylinder block 50. When the hydraulic cylinder 5 is vertically arranged, the driving mechanism 4 can drive the piston simulation rod 2 to reach above the entrance of the hydraulic cylinder 5 through horizontal movement, and then vertically drive the piston simulation rod 2 to move downward, so that the piston simulation rod 2 partially extends into the cylinder block 50, realizing the simulation of the piston and the sealing cooperation with the leather cup.

[0064] As Figure 3 、 Figure 4 and Figure 5As shown in the figure, a piston section for sealingly mating with a leather cup is provided on the rod body of the piston simulation rod 2 of this embodiment, and a connecting portion 23 is provided at the end of the piston simulation rod 2. Among them, the piston simulation rod 2 is connected to the driving mechanism 4 through the connecting portion 23, and the diameter of the piston section is smaller than the diameter of the piston it simulates. By providing a piston section for sealing mating and a connecting portion 23 for connection and installation on the piston simulation rod 2, the sealing with the leather cup and the installation and connection with the driving mechanism 4 can be respectively achieved. Making the diameter of the piston section smaller than the diameter of the piston it is to simulate can achieve the fully expanded state of the leather cup, so as to test the sealing performance of the leather cup under extreme sealing conditions; obviously, the diameter of the piston will randomly vary within its machining tolerance range, so the diameter of the piston section should be made smaller than the minimum value (lower tolerance limit) within the machining tolerance range of the actual piston to ensure that the extreme sealing state of the leather cup can be tested.

[0065] In addition, in order to flexibly detect the situation where there are multiple leather cups in the hydraulic cylinder 5, the piston simulation rod 2 can be designed flexibly accordingly. Specifically, as Figure 5 and in combination with Figure 6 or Figure 7 shown, on the piston simulation rod 2 of this embodiment, the piston section includes a front piston section 21 and a rear piston section 22 arranged at intervals, and the part of the rod body of the piston simulation rod 2 between the front piston section 21 and the rear piston section 22 is set as a reduced-diameter section 20. Among them, the front piston section 21 and the rear piston section 22 can respectively seal and mate with two groups of leather cups arranged at intervals on the inner wall of the cylinder block 50, and an inflation chamber is formed between the reduced-diameter section 20 and the inner wall of the cylinder block 50. As Figure 6 shown in the figure, there are two groups of leather cups in the hydraulic cylinder 5. The first leather cup 61 and the second leather cup 62 are one group, and the rear piston section 22 cooperates with this group of leather cups; the third leather cup 63 and the fourth leather cup 64 are one group, and the front piston section 21 cooperates with this group of leather cups. A first inflation chamber 51 is formed between the reduced-diameter section 20 and the cylinder block 50, and a second inflation chamber 52 is also formed at one end of the piston simulation rod 2 away from the connecting portion 23. Both inflation chambers can be used for inflation to respectively detect the assembly and sealing conditions of the relevant leather cups.

[0066] By providing two piston sections and machining a reduced-diameter section 20 between the two piston sections, the diameter of the reduced-diameter section 20 should obviously be much smaller than the diameter of the piston section, so that there are gaps between the reduced-diameter section 20 and the inner wall of the cylinder block 50 and between the reduced-diameter section 20 and the inner wall 600 of the leather cup, ensuring that the leather cup is avoided from the reduced-diameter section 20 and realizing the idle stroke interval of the piston simulation rod 2; by inflating the inflation chamber formed between the reduced-diameter section 20 and the inner wall of the cylinder block 50, the sealing conditions of the leather cups on the cylinder block 50 that are respectively sealed and mated with the front piston section 21 and the rear piston section 22 can be detected.

[0067] In addition, the hydraulic cylinder 5 fixed on the detection table 1 preferably adopts a vertically arranged form, and the inlet of the hydraulic cylinder 5 is located at the top of the cylinder body 50. At the same time, a floating sleeve 40 is provided on the driving mechanism 4, and the connecting portion 23 is connected to the floating sleeve 40; the piston simulation rod 2 is hoisted directly above the hydraulic cylinder 5 by the floating sleeve 40. During the process of the driving mechanism 4 driving the floating sleeve 40 to move horizontally, the alignment between the floating sleeve 40 and the inlet of the hydraulic cylinder 5 is achieved, that is, the piston simulation rod 2 is directly opposite the inlet, so as to perform the subsequent downward insertion action. Since the floating sleeve 40 is used to load the piston simulation rod 2, after aligning with the inlet of the hydraulic cylinder 5, the piston simulation rod 2 can float on the floating sleeve 40 within the alignment deviation range of the floating sleeve 40, so as to ensure that the piston simulation rod 2 can smoothly extend into the cylinder body 50.

[0068] Setting the floating sleeve 40 on the driving mechanism 4 can well overcome the problem of alignment deviation between the floating sleeve 40 and the inlet of the hydraulic cylinder 5. When the driving mechanism 4 carries the floating sleeve 40 and moves to directly above the hydraulic cylinder 5, the alignment action between the floating sleeve 40 and the inlet of the hydraulic cylinder 5 is completed, so that the piston simulation rod 2 is directly opposite the inlet of the hydraulic cylinder 5; since the connecting portion 23 is arranged inside the floating sleeve 40, it allows the piston simulation rod 2 to move within the horizontal range of the alignment deviation, so that the rod body of the piston simulation rod 2 can smoothly move downward and extend into the cylinder body 50 during the downward movement driven by the driving mechanism 4, avoiding interference, collision and severe friction between the rod body of the piston simulation rod 2 and the inner wall of the cylinder body 50.

[0069] Of course, the up and down driving of the driving mechanism 4 can adopt a servo motor, and the interference and excessive friction during the process of the piston simulation rod 2 extending into the cylinder body 50 are monitored by detecting the power overload of the motor, so as to alarm in time and correct the problem of abnormal alignment, thus completely avoiding collision damage between the piston simulation rod 2 and the hydraulic cylinder 5. For the specific connection and installation form between the floating sleeve 40 and the connecting portion 23, corresponding designs can be made with reference to the existing floating cylinder setting structure; for example, an axially arranged positioning hole 231 can be opened at the center of the end of the connecting portion 23, and a radial connecting hole 230 can be set on the connecting portion 23 at the same time. Correspondingly, a positioning column is set in the floating sleeve 40, and the positioning column is inserted into the positioning hole 231, and the two are in clearance fit, allowing the piston simulation rod 2 to move within the alignment tolerance range; the connecting hole 230 is arranged along the horizontal movement alignment direction of the driving mechanism 4, and a connecting pin is inserted therein to install the piston simulation rod 2 on the floating sleeve 40. The connecting pin mainly limits the up and down relative movement between the piston simulation rod 2 and the floating sleeve 40, allowing the piston simulation rod 2 to move in the alignment movement direction (i.e., the axial direction of the connecting pin), so as to achieve the purpose of the piston simulation rod 2 moving horizontally within the alignment tolerance range on the floating sleeve 40.

[0070] Regarding the configuration of the inflation unit 3, of course, there are various different structural solutions to choose from. In this embodiment, as Figure 6 or Figure 7 shown, the inflation unit 3 includes an air supply pipeline 31 connected between a compressed air source 330 and an inflation chamber, and a control valve provided on the air supply pipeline 31; the pressure detection component includes a pressure sensor provided on the air supply pipeline 31 between the control valve and the inflation chamber. By providing a control valve on the air supply pipeline 31, the on-off state of the air supply pipeline 31 can be flexibly controlled to timely fill the inflation chamber with compressed gas. By providing a pressure sensor on the air supply pipeline 31 downstream of the control valve, through the detection of the pressure sensor, the air pressure in the inflation chamber can be understood in real time, that is, the air pressure value in the inflation chamber required for the leather cup detection can be obtained.

[0071] For the case where multiple groups of leather cups are provided in the hydraulic cylinder 5, in this embodiment, a first branch 311 and a second branch 312 are arranged in parallel on the air supply pipeline 31. A first control valve 301 is provided on the first branch 311, and a third control valve 303 is provided on the second branch 312. The two branches can be respectively controlled to be on or off to correspondingly inflate the first inflation chamber 51 and the second inflation chamber 52 in the cylinder block 50. The above-mentioned pressure detection component includes a first pressure sensor 321 provided on the first branch 311 and a second pressure sensor 322 provided on the second branch 312.

[0072] At the same time, an exhaust pipeline with controllable on-off can also be connected and provided on the air supply pipeline 31 between the control valve and the inflation chamber; a pressure regulating valve 331 can also be provided on the air supply pipeline 31 upstream of the control valve. By connecting and providing an exhaust pipeline on the air supply pipeline 31 downstream of the control valve, the exhaust pipeline can be disconnected during the inflation detection stage; after the detection is completed, the exhaust pipeline can be conducted to discharge the gas in the inflation chamber. The on-off control of the exhaust pipeline can adopt the method of adding an electromagnetic valve. By providing a pressure regulating valve 331 on the air supply pipeline 31 upstream of the control valve, the air supply pressure value of the air supply pipeline 31 can be adjusted to provide compressed gas with a suitable pressure according to the detection requirements of the leather cup.

[0073] Specifically, a first exhaust pipeline 313 is connected to the first branch 311. A second control valve 302 is provided on the first exhaust pipeline 313, and a first muffler 341 is further provided at the end of the first exhaust pipeline 313. A second exhaust pipeline 314 is connected to the second branch 312. A fourth control valve 304 is provided on the second exhaust pipeline 314, and a second muffler 342 is further provided at the end of the second exhaust pipeline 314. The setting of the muffler can reduce the noise generated by exhaust when discharging the gas in the inflation chamber.

[0074] In addition, the inflation unit 3 of this embodiment further includes a switching pipeline with controllable on-off; as Figure 6 orFigure 7 As shown, the switching pipeline includes a first switching pipeline 315 and a second switching pipeline 316. Among them, the first switching pipeline 315 is connected to the cylinder block 50 and communicates with the chamber between the adjacent first leather cup 61 and the second leather cup 62 on the inner wall of the cylinder block 50; the second switching pipeline 316 is connected to the cylinder block 50 and communicates with the chamber between the adjacent third leather cup 63 and the fourth leather cup 64 on the inner wall of the cylinder block 50. By changing the on-off state of the switching pipeline, it is possible to selectively detect one of the two adjacent leather cups in the same group. A fifth control valve 305 is provided on the first switching pipeline 315, and a sixth control valve 306 is provided on the second switching pipeline 316, so as to realize the on-off control of the corresponding pipeline.

[0075] Adding a switching pipeline can meet the situation where there are multiple leather cups arranged adjacent to each other in the cylinder block 50, and realize flexible and efficient detection of multiple leather cups in the cylinder block 50. By setting a solenoid valve on the switching pipeline to control the on-off of the switching pipeline, and cooperating with the adjustment of the insertion position of the piston simulation rod 2 in the cylinder block 50, the transition part between the reduced diameter section 20 and the piston section is moved between two adjacent leather cups, and at the same time the solenoid valve is closed, the detection of the leather cup on the piston section can be completed; moving the piston section to the position of two leather cups can detect the two leather cups.

[0076] Based on the above overall setting situation, the working principle of the detection device in this embodiment is as follows:

[0077] As Figure 6 Combined with Figure 8 、 Figure 9 As shown, there are two groups of leather cups in the hydraulic cylinder 5. One group consists of the first leather cup 61 and the second leather cup 62, and the mouths of the two leather cups are both arranged facing the bottom side of the cylinder block 50. The other group consists of the third leather cup 63 and the fourth leather cup 64, and the mouths of the two leather cups are arranged back to back. There are a front piston section 21 and a rear piston section 22 arranged at intervals on the piston simulation rod 2. A first inflation chamber 51 is formed between the reduced diameter section 20 and the cylinder block 50, and a second inflation chamber 52 is formed between the end of the piston simulation rod 2 and the bottom of the cylinder block 50. Of course, the number and assembly method of the leather cups of the hydraulic cylinder 5 shown in this embodiment are a specific exemplary display. For different situations of the assembly quantity and method of the leather cups in the hydraulic cylinder 5, the detection method and detection device of the present invention can also perform corresponding leather cup detection.

[0078] Still taking Figure 6 And Figure 7Taking the hydraulic cylinder 5 shown as an example, using the driving effect of the driving mechanism 4, the depth position of the piston simulation rod 2 inserted into the interior of the cylinder body 50 is controlled to detect the leather cups at different positions. The outer walls 601 of each leather cup are all in sealing fit with the grooves on the inner wall of the cylinder body 50, and the inner walls 600 of the leather cups are selectively in sealing fit with the front piston section 21 or the rear piston section 22, thereby realizing the detection of different leather cups.

[0079] Specifically, when the depth position of the piston simulation rod 2 inserted is as Figure 6 shown, the second leather cup 62 is located inside the first inflation chamber 51, the first leather cup 61 is in sealing fit with the rear piston section 22, and the third leather cup 63 and the fourth leather cup 64 are both in sealing fit with the front piston section 21. At this time, the first control valve 301 is opened, the third control valve 303 and the second control valve 302 are closed, and the fifth control valve 305 is also closed. The compressed air provided by the compressed air source 330 enters the first inflation chamber 51 through the first branch 311 and along Figure 8 and Figure 9 the directions indicated by the arrows in, crosses the second leather cup 62 and reaches the first leather cup 61, lifting the first leather cup 61; at the same time, the third leather cup 63 is lifted on the other side of the first inflation chamber 51. When the first leather cup 61 and the third leather cup 63 are assembled in place, they can form a closure of the first inflation chamber 51, enabling the first inflation chamber 51 to be filled with compressed air so that the air pressure value in the first inflation chamber 51 reaches the target air pressure value. At this moment, it can be proved that there are no large areas of unassembled and missing parts in the two leather cups of the first leather cup 61 and the third leather cup 63. Subsequently, the first control valve 301 is closed, and the sealing and pressure-holding performance test stage is entered. The change of the air pressure value is read in real time through the first pressure sensor 321. If the air pressure decay threshold in the first inflation chamber 51 does not exceed the specified air pressure decay amount within the set time, it is proved that there is no minor leakage in the first leather cup 61 and the third leather cup 63, and the sealing performance of the first leather cup 61 and the third leather cup 63 is determined to be qualified. After the test is completed, the second control valve 302 is opened to release the air, and the test process of the first leather cup 61 and the third leather cup 63 is completed.

[0080] Still in Figure 6In the shown position state, the third control valve 303 is opened, the fourth control valve 304 and the first control valve 301 are closed, and the second inflation chamber 52 is inflated. Then, the fourth leather cup 64 will be lifted. When the fourth leather cup 64 is assembled in place, it can form a seal for the second inflation chamber 52, enabling the second inflation chamber 52 to be filled with compressed air so that the air pressure value in the second inflation chamber 52 reaches the target air pressure value. At this moment, it can be proved that there is no situation where the fourth leather cup 64 is not assembled in place over a large area or is missing. Subsequently, the third control valve 303 is closed, and the sealed pressure-holding performance test stage is entered. The change in the air pressure value is read in real time through the second pressure sensor 322. If the air pressure decay threshold in the second inflation chamber 52 does not exceed the specified air pressure decay amount within the set time, it is proved that there is no minor leakage in the fourth leather cup 64, and the sealing performance of the fourth leather cup 64 is determined to be qualified. After the test is completed, the fourth control valve 304 is opened to deflate, and the test process of the fourth leather cup 64 is completed.

[0081] It can be seen that Figure 6 at the position of the piston simulation rod 2 in the figure, the first leather cup 61, the third leather cup 63 and the closed fifth control valve 305 form a sealed space, that is, the first inflation chamber 51 waiting to be filled with gas, thereby meeting the airtight test conditions for the first leather cup 61 and the third leather cup 63. Similarly, when the piston simulation rod 2 moves to Figure 7 the shown position, a sealed space is formed between the second leather cup 62 and the third leather cup 63, that is, the first inflation chamber 51 waiting to be filled with gas in another test state, thereby meeting the airtight test conditions for the second leather cup 62 and the third leather cup 63. Figure 7 The detection process of the second leather cup 62 and the third leather cup 63 in the shown state position is similar to the detection process of the first leather cup 61 and the third leather cup 63, and will not be elaborated here.

[0082] Generally speaking, by using the detection device of the present invention, the interference generated by external variables can be completely excluded, and 100% functional testing of the leather cups can be achieved when they are assembled on site. For leather cups with improper assembly or unqualified sealing performance, they can be directly replaced; it avoids the situation where problems with the assembly and sealing of the leather cups are found after the piston has been assembled, and it is necessary to disassemble the hydraulic cylinder 5 and disassemble the relevant components of the main cylinder for repair.

[0083] Moreover, in the detection device of the present invention, by manufacturing a piston simulation rod 2 with a diameter smaller than the minimum tolerance of the outer diameter of the piston, the state where the leather cup is fully expanded can be simulated, and thus the fitting condition between the piston group and the leather cup under different working states can be detected. For the inflation unit 3, by arranging a plurality of solenoid valves for controlling on / off in the inflation unit 3 and forming different sealing circuits by controlling the opening and closing of different solenoid valves, the pulse capacity test of the normally closed valve at the simulator end can be carried out simultaneously. After the test, the simulator assembly and the sealing cover can be assembled immediately, optimizing the technological process and making the test results more accurate.

[0084] In the existing leather cup detection methods, the following main problems exist in the on-site detection methods. The visual camera and the endoscope can only take pictures to identify the presence or absence of the leather cup. When the installation depth of the leather cup is too deep, the visual camera cannot take pictures either, and it is impossible to judge whether the leather cup in the deep part is missing. It is impossible to detect and judge whether the leather cup is assembled in place and its sealing performance. The stop mechanism judges by inserting a special tool into the chamber of the hydraulic cylinder. If there is a warping of the leather cup, the stop mechanism is blocked by the leather cup and counteracts its own gravity to lift up, contacting the photoelectric sensor at the top of the sleeve, judging that the leather cup is not in place. In this case, only the situation where the leather cup is not assembled in place in a large range can be judged, and it is still impossible to judge whether the assembly direction of the leather cup is correct, whether it is fully assembled, and whether there is any damage or leakage of the leather cup. In short, the on-site detection methods are all based on the shape and state of the leather cup in the main cylinder chamber, and the process characteristics of the assembly shape and state cannot be clearly reflected as the functional characteristics of the leather cup, ignoring the sealing function and effect of the leather cup itself.

[0085] For the performance test of the subsequent workstations, after the assembly of the piston is completed, the pressure building capacity of the hydraulic cylinder product needs to be tested during the actual hydraulic pressure establishment process; once it is found that the pressure building performance of the product is insufficient, it is also necessary to disassemble the product and check each leather cup one by one to determine the leather cup that is not assembled in place or has its own defects, and then replace the corresponding leather cup; the whole detection and troubleshooting process is very cumbersome, the detection efficiency is low, and the ability to detect leather cup assembly problems in advance is too poor.

[0086] Compared with the existing leather cup detection means, the detection device of the present invention can intuitively reflect the assembly effect of the leather cup without the error caused by characteristic conversion. Moreover, the detection purpose of detecting the micro-leakage of the damaged leather cup, that is, the detection of the micro-leakage of the leather cup itself, which cannot be achieved by the existing detection methods, is realized. In terms of the production process, the detection method of the present invention does not require the overall airtight detection after assembling the master cylinder piston assembly to achieve the purpose of testing the performance of the leather cup. When the performance of the leather cup at the station is unqualified, the leather cup can be directly replaced to solve the problem, greatly reducing the rework man-hours of unqualified parts. And because there is no need to disassemble the master cylinder assembly of the hydraulic cylinder 5, the scratches, damages and thread hole damages caused by manual disassembly of the master cylinder assembly are completely avoided. Furthermore, through the on-site detection of the leather cup and the subsequent overall airtight detection, the risk of unqualified products flowing into the hands of customers is also completely isolated, which is beneficial to the production process monitoring of related safety components such as the electronic stability control system.

[0087] In summary, by setting up the detection table 1, the hydraulic cylinder 5 to be detected can be fixed to the detection table 1; by configuring the piston simulation rod 2 and the inflation unit 3, the piston simulation rod 2 extending into the cylinder block 50 is used to simulate the piston, and is hermetically matched with the leather cup on the inner wall of the cylinder block 50 to form an inflation chamber to be inflated and detected. The inflation unit 3 is used to fill the inflation chamber with gas at a set pressure. By detecting and observing the air pressure value measured by the pressure detection component, it can be understood whether the inflation chamber can be inflated to reach the required target air pressure value, and thus it can be accurately and effectively known whether the assembly of the leather cup is in place, so as to achieve the purpose of pre-detecting the assembly situation of the leather cup, thereby providing a technical solution and a detection device suitable for detecting the assembly situation of the leather cup in the hydraulic cylinder 5 of the braking system.

[0088] Embodiment 2

[0089] This embodiment relates to a detection method for detecting the assembly situation of the seal in the cylinder block 50, and provides a technical solution suitable for pre-detecting the assembly situation of the seal in the cylinder block 50; an exemplary system flow thereof is as Figure 10 shown.

[0090] Generally speaking, the detection method includes:

[0091] S1. Insert the piston simulation rod 2 into the cylinder block 50 of the hydraulic cylinder 5 so that the piston simulation rod 2 is hermetically matched with the seal located on the inner wall of the cylinder block 50, so as to form a closed inflation chamber on one side of the seal;

[0092] S2. Fill the inflation chamber with gas at a set pressure and continuously obtain the change of the air pressure value in the inflation chamber;

[0093] S3. Compare the air pressure value with the preset target air pressure value, and when the air pressure value reaches the set target air pressure value, it is determined that the seal is assembled in place.

[0094] The detection method of this embodiment is applicable to the detection device of Embodiment 1 and has the technical advantages possessed by the above detection device.

[0095] It should be noted that based on the above overall design concept, the technical solutions of the present invention can adopt a variety of different specific implementation forms or configuration sequences. For example, this detection method can be used for the detection of the leather cup inside the cylinder block 50 of the hydraulic cylinder 5 that provides the brake oil pressure configured in the braking system, or can also be used for the assembly detection of the seals inside the cylinder body of the hydraulic cylinder in other hydraulic application scenarios. The acquisition of the air pressure value in the inflation chamber can be monitored and obtained through the pressure detection components arranged inside the cylinder block 50 or on the air supply pipeline 31. For the parts required for the implementation of the overall solution but not involved in the above overall setting, reasonable and flexible design can be made with reference to the mature setting means in the art, the actual situation during implementation, etc. For the sake of easy expression and understanding, this embodiment still takes the cylinder block 50 of the hydraulic cylinder 5 in the braking system and the leather cup assembled thereon as an example for illustration.

[0096] Of course, the pressure of the gas with the set pressure provided by the inflation unit 3 should be above the target air pressure value; at the same time, step S3 should be completed within a certain time, that is to say, the air pressure value should reach the target air pressure value within the set inflation time. If the continuous inflation of the inflation chamber within the set inflation time cannot make the air pressure value in the inflation chamber reach the target air pressure value, it can be determined that there is a problem with the assembly of the seal in the hydraulic cylinder 5. After step S3 is completed, for the case where the air pressure value can reach the set target air pressure value, it is determined that the seal is assembled in place.

[0097] In the case of determining that the seal is assembled in place, the detection method of this embodiment further includes a step S4 for testing the seal pressure retention performance of the seal. Specifically, this step S4 for testing the seal pressure retention performance includes:

[0098] S41. Obtain the air pressure decay amount in the inflation chamber within the set time;

[0099] S42. Compare the air pressure decay amount with the preset air pressure decay threshold. When the air pressure decay amount is below the air pressure decay threshold, it is determined that the seal pressure retention performance of the seal is qualified.

[0100] Of course, in step S42, if the air pressure decay amount exceeds the preset air pressure decay threshold, it can be determined that there is a leakage problem with the seal, that is, the seal pressure retention performance is unqualified.

[0101] When the assembly is in place, a sealing and pressure-holding performance test is carried out on the inflatable chamber formed by the seal. By checking and comparing whether the air pressure attenuation in the inflatable chamber exceeds the preset air pressure attenuation threshold, it is possible to accurately determine whether there are damages, micro-leaks, etc. in the seal, and then determine whether the sealing and pressure-holding performance of the seal is qualified, making the detection method of the present invention have more complete seal detection performance and effects.

[0102] Specifically for the leather cup of the cylinder block 50 of the hydraulic cylinder 5 in the braking system, since the cross-section of the leather cup is in a specific bowl-like structure, the inner wall of the leather cup fits with the piston, and the outer wall of the leather cup fits with the inner wall of the cylinder block of the hydraulic cylinder. The side where the mouth of the leather cup faces is the hydraulic chamber (i.e., the inflatable chamber for the above-mentioned inflation detection), in the brake fluid environment and in a stretched free state. When pressure is generated inside the pressure-building cylinder, the leather cup is forced to expand, and the inner and outer walls respectively adhere tightly to the groove on the inner wall of the cylinder block of the hydraulic cylinder and the outer circular surface of the piston, forming a sealing effect.

[0103] Among the existing means for detecting the assembly condition of the seal in the cylinder block 50, the existing detection means include visual camera judgment, endoscope judgment, stop mechanism judgment, etc.; visual camera and endoscope judgment can only take pictures to identify the presence or absence of the leather cup. When the installation depth of the leather cup is too deep, the visual camera will not be able to take pictures either, and it is impossible to judge whether the leather cup deep inside is missing. The stop mechanism judgment uses a special tooling to go deep into the chamber of the hydraulic cylinder. The stop mechanism is blocked by the leather cup and counteracts its own gravity to lift up and contact the photoelectric sensor at the top of the sleeve to judge that the leather cup is not in place; this situation cannot detect the damage and leakage of the leather cup either. The subsequent station performance test is achieved through the pressure-building ability of the product during the test and the airtight test of the assembly. It is necessary to test the pressure-building ability of the hydraulic cylinder product during the real hydraulic pressure establishment process after the piston is assembled; once it is found that the pressure-building performance of the product is insufficient, it is also necessary to replace the corresponding leather cup, and the ability to detect the leather cup assembly problem in advance is too poor.

[0104] Compared with the existing detection means, it can be seen that the detection method of this embodiment uses the piston simulation rod 2 to replace the piston adapted to the hydraulic cylinder 5, and pre-detects the assembly condition of the leather cup inside the cylinder block 50 of the hydraulic cylinder 5, and can eliminate the situation where the leather cup is not assembled in place; by using the sealing cooperation between the piston simulation rod 2 and the inner wall 600 of the leather cup, a closed inflatable chamber will be formed inside the cylinder block 50 on the side where the mouth of the leather cup faces. By inflating the inflatable chamber and checking whether the inflation can reach the set target air pressure value, it is possible to accurately and effectively know whether the assembly of the leather cup is in place, so as to achieve the purpose of pre-detecting the assembly condition of the leather cup, thereby providing a technical solution suitable for detecting the assembly condition of the leather cup in the hydraulic cylinder 5 in the braking system.

[0105] The above are only the preferred embodiments of the present invention. The detailed explanations of the configuration, examples of specific structural settings, or descriptions of assembly connection methods are all for the need of full disclosure, so that those skilled in the art can better implement the present invention, rather than to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A detection device for detecting the assembly condition of a seal in a cylinder block (50), characterized in that: It includes a detection table (1) for fixing the cylinder block (50), a piston simulation rod (2) that can extend into the cylinder block (50), and an inflation unit (3); The piston simulation rod (2) extending into the cylinder block (50) can be in sealing cooperation with the seal on the inner wall of the cylinder block (50) to form a sealed inflation chamber on one side of the seal; The inflation unit (3) is used to fill the inflation chamber with gas at a set pressure, and a pressure detection component for detecting the air pressure value in the inflation chamber is provided in the inflation unit (3).

2. The detection device according to claim 1, characterized in that: It further includes a driving mechanism (4) provided on the detection table (1), and the piston simulation rod (2) is provided on the driving mechanism (4); The driving mechanism (4) can move the piston simulation rod (2) to the entrance of the cylinder block (50) and can drive the piston simulation rod (2) to extend to a set position in the cylinder block (50).

3. The detection device according to claim 2, characterized in that: A piston section for sealing cooperation with the seal is provided on the rod body of the piston simulation rod (2), and a connecting portion (23) is provided at the end of the piston simulation rod (2); The piston simulation rod (2) is connected to the driving mechanism (4) through the connecting portion (23), and the diameter of the piston section is smaller than the piston diameter of the piston it simulates.

4. The detection device according to claim 3, characterized in that: The piston section includes a front piston section (21) and a rear piston section (22) arranged at intervals, and the part of the rod body of the piston simulation rod (2) between the front piston section (21) and the rear piston section (22) is set as a reduced-diameter section (20); The front piston section (21) and the rear piston section (22) can be respectively in sealing cooperation with two groups of seals arranged at intervals on the inner wall of the cylinder block (50), and the inflation chamber is formed between the reduced-diameter section (20) and the inner wall of the cylinder block (50).

5. The detection device according to claim 3, characterized in that: The cylinder blocks (50) fixed on the detection table (1) are arranged vertically, and the entrances of the cylinder blocks (50) are located at the top; a floating sleeve (40) is provided on the driving mechanism (4), and the connecting portion (23) is connected to the floating sleeve (40); After the driving mechanism (4) drives the floating sleeve (40) to align with the entrance of the cylinder block (50), the piston simulation rod (2) can float on the floating sleeve (40) within the alignment deviation range of the floating sleeve (40) to smoothly extend into the cylinder block (50).

6. The detection device according to any one of claims 1 to 5, characterized in that: The inflation unit (3) includes an air supply pipeline (31) communicating between a compressed air source (330) and the inflation chamber, and a control valve provided on the air supply pipeline (31); the pressure detection component includes a pressure sensor provided on the air supply pipeline (31) between the control valve and the inflation chamber.

7. The detection device according to claim 6, characterized in that: An exhaust pipeline with controllable on / off is communicated on the air supply pipeline (31) between the control valve and the inflation chamber, and / or a pressure regulating valve (331) is provided on the air supply pipeline (31) upstream of the control valve.

8. The detection device according to claim 6, characterized in that: The inflation unit (3) further includes a switching pipeline with controllable on / off; The switching pipeline is connected to the cylinder block (50) and communicates with the chamber between two adjacent seals on the inner wall of the cylinder block (50). By changing the on / off state of the switching pipeline, one of the two seals can be selectively detected.

9. A detection method for detecting the assembly condition of a seal in a cylinder block (50), characterized in that, The method includes: Inserting a piston simulation rod (2) into the cylinder block (50) so that the piston simulation rod (2) is sealingly fitted with the seal on the inner wall of the cylinder block (50) to form a sealed inflation chamber on one side of the seal; Inflating the inflation chamber with gas at a set pressure and obtaining the change of the air pressure value in the inflation chamber in real time; Comparing the air pressure value with a preset target air pressure value, and when the air pressure value reaches the set target air pressure value, determining that the seal is assembled in place.

10. The detection method according to claim 9, characterized in that: In the case of determining that the seal is assembled in place, the detection method further includes a test on the seal pressure retention performance of the seal; The seal pressure retention performance test includes: Obtaining the air pressure attenuation amount of the inflation chamber within a set time; Comparing the air pressure attenuation amount with a preset air pressure attenuation threshold value. When the air pressure attenuation amount is below the air pressure attenuation threshold value, it is determined that the seal pressure retention performance of the seal is qualified.

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